@article{Leu:02a,
  year = 2002,
  volume = 8,
  number = {1--2},
  journal = {Journal of Multiple-Valued Logic},
  author = {Leu\c stean, Lauren\c tiu},
  title = {Canonical models and filtrations in three-valued propositional modal
           logic},
  pages = {577--590},
}